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arXiv 1504.01845astro-ph.HE
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iPTF 13 bvn中喷出物-伴流相互作用的可能特征

Possible Signatures of Ejecta-Companion Interaction in iPTF 13bvn

Ryosuke Hirai, Shoichi Yamada

摘要:

我们研究了超新星喷出物撞击iPTF 13 bvn中伴星的可能影响,重点是当它变得可见时的可观测特征。iPTF 13 bvn是一颗Ib型超新星,可能成为第一个通过近期观测确定其前身为双星的案例。根据Bersten等人(2014)的计算,其前身星的质量应该是$\approx3.5M_\odot$,以重现超新星的光变曲线,而这样的致密恒星只能通过双星演化产生。这也是我们认为它的前身是双星的原因之一,但这需要通过观察超新星爆炸后剩下的伴星来证实。他们的演化计算表明,伴星在超新星爆发的那一刻将是一颗过亮的OB星。结合流体动力学和演化模拟,我们发现次级恒星将被超新星喷出物加热,并膨胀到具有更大的光度和更低的表面有效温度。这颗恒星看起来更像是一颗红超巨星,在未来的观测中,在超新星喷出物中寻找伴星时应该考虑到这一点。

英文摘要:

We investigate the possible effects of the supernova ejecta hitting the companion star in iPTF 13bvn, focusing on the observable features when it becomes visible. iPTF 13bvn is a type Ib supernova that may become the first case that its progenitor is identified as a binary by near future observations. According to calculations by Bersten et al. (2014), the progenitor should have a mass $\approx3.5M_\odot$ to reproduce the supernova light curve, and such compact stars could only be produced via binary evolution. This is one of the reasons that we expect the progenitor to be a binary, but it should be confirmed by observing the remaining companion after the supernova. Their evolutionary calculations suggest that the companion star will be an overluminous OB star at the moment of supernova. With a combination of hydrodynamical and evolutionary simulations, we find that the secondary star will be heated by the supernova ejecta and expand to have larger luminosities and lower surface effective temperatures. The star will look rather like a red super giant, and this should be taken into account when searching for the companion star in the supernova ejecta in future observations.

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